Irrigation Engineering (Set-2)

The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by

• direct runoff volume

• period of storm

• total rainfall

• none of the above

S-hydrograph is used to obtained unit hydrograph of

• shorter duration from longer duration

• longer duration from shorter duration

• both (a) and (b)

• none of the above

If two 4-hour unit hydrograph are staggered by 4 hours and added graphically, the resulting hydrograph will be

• 4-hour unit hydrograph

• 4-hour hydrograph with 20 mm runoff

• 8-hour unit hydrograph

• 8-hour hydrograph with 20 mm runoff

According to Dicken’s formula for estimating floods, the peak discharge is proportional to

• A

• A^1/2

• A^2/3

• A^3/4

The relation between probability (P) and recurrence interval(T) is given by

• PT = 1

• PT² = 1

•  P/T = 1

• P/T² = 1

Dimension of coefficient of transmissibility are

• M⁰L⁰T⁰

• M⁰L¹T^-1

• M⁰L²T^-1

• M⁰L³T^-1

An artesian aquifer is the one where

• water surface under the ground is at atmosphere pressure

• water is under pressure between two impervious strata

• water table serves as upper surface of zone of saturation

• none of the above

A deep well

• is always deeper than a shallow well

• has more discharge than a shallow well

• is weaker structurally than a shallow well

• both (a) and (b)

The useful storage is the volume of water stored in the reservoir between

• minimum pool level and maximum pool level

• minimum pool level and normal pool level

• normal pool level and maximum pool level

• river bed and minimum pool level

For a flood control reservoir, the effective storage is equal to

• useful storage - valley storage

• useful storage + surcharge storage

• useful storage + surcharge storage + valley storage

• useful storage + surcharge storage – valley storage